1 files changed, 46 insertions, 51 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 8fec28ff4a0..3ac91086f41 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -182,10 +182,11 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 	struct inode *inode;
 	struct dentry *parent;
 	struct fuse_conn *fc;
+	int ret;
 
 	inode = ACCESS_ONCE(entry->d_inode);
 	if (inode && is_bad_inode(inode))
-		return 0;
+		goto invalid;
 	else if (fuse_dentry_time(entry) < get_jiffies_64()) {
 		int err;
 		struct fuse_entry_out outarg;
@@ -195,20 +196,23 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 
 		/* For negative dentries, always do a fresh lookup */
 		if (!inode)
-			return 0;
+			goto invalid;
 
+		ret = -ECHILD;
 		if (flags & LOOKUP_RCU)
-			return -ECHILD;
+			goto out;
 
 		fc = get_fuse_conn(inode);
 		req = fuse_get_req_nopages(fc);
+		ret = PTR_ERR(req);
 		if (IS_ERR(req))
-			return 0;
+			goto out;
 
 		forget = fuse_alloc_forget();
 		if (!forget) {
 			fuse_put_request(fc, req);
-			return 0;
+			ret = -ENOMEM;
+			goto out;
 		}
 
 		attr_version = fuse_get_attr_version(fc);
@@ -227,7 +231,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 			struct fuse_inode *fi = get_fuse_inode(inode);
 			if (outarg.nodeid != get_node_id(inode)) {
 				fuse_queue_forget(fc, forget, outarg.nodeid, 1);
-				return 0;
+				goto invalid;
 			}
 			spin_lock(&fc->lock);
 			fi->nlookup++;
@@ -235,7 +239,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 		}
 		kfree(forget);
 		if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
-			return 0;
+			goto invalid;
 
 		fuse_change_attributes(inode, &outarg.attr,
 				       entry_attr_timeout(&outarg),
@@ -249,7 +253,15 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 			dput(parent);
 		}
 	}
-	return 1;
+	ret = 1;
+out:
+	return ret;
+
+invalid:
+	ret = 0;
+	if (check_submounts_and_drop(entry) != 0)
+		ret = 1;
+	goto out;
 }
 
 static int invalid_nodeid(u64 nodeid)
@@ -267,26 +279,6 @@ int fuse_valid_type(int m)
 		S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
 }
 
-/*
- * Add a directory inode to a dentry, ensuring that no other dentry
- * refers to this inode.  Called with fc->inst_mutex.
- */
-static struct dentry *fuse_d_add_directory(struct dentry *entry,
-					   struct inode *inode)
-{
-	struct dentry *alias = d_find_alias(inode);
-	if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
-		/* This tries to shrink the subtree below alias */
-		fuse_invalidate_entry(alias);
-		dput(alias);
-		if (!hlist_empty(&inode->i_dentry))
-			return ERR_PTR(-EBUSY);
-	} else {
-		dput(alias);
-	}
-	return d_splice_alias(inode, entry);
-}
-
 int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 		     struct fuse_entry_out *outarg, struct inode **inode)
 {
@@ -345,6 +337,24 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 	return err;
 }
 
+static struct dentry *fuse_materialise_dentry(struct dentry *dentry,
+					      struct inode *inode)
+{
+	struct dentry *newent;
+
+	if (inode && S_ISDIR(inode->i_mode)) {
+		struct fuse_conn *fc = get_fuse_conn(inode);
+
+		mutex_lock(&fc->inst_mutex);
+		newent = d_materialise_unique(dentry, inode);
+		mutex_unlock(&fc->inst_mutex);
+	} else {
+		newent = d_materialise_unique(dentry, inode);
+	}
+
+	return newent;
+}
+
 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
 				  unsigned int flags)
 {
@@ -352,7 +362,6 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
 	struct fuse_entry_out outarg;
 	struct inode *inode;
 	struct dentry *newent;
-	struct fuse_conn *fc = get_fuse_conn(dir);
 	bool outarg_valid = true;
 
 	err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
@@ -368,16 +377,10 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
 	if (inode && get_node_id(inode) == FUSE_ROOT_ID)
 		goto out_iput;
 
-	if (inode && S_ISDIR(inode->i_mode)) {
-		mutex_lock(&fc->inst_mutex);
-		newent = fuse_d_add_directory(entry, inode);
-		mutex_unlock(&fc->inst_mutex);
-		err = PTR_ERR(newent);
-		if (IS_ERR(newent))
-			goto out_iput;
-	} else {
-		newent = d_splice_alias(inode, entry);
-	}
+	newent = fuse_materialise_dentry(entry, inode);
+	err = PTR_ERR(newent);
+	if (IS_ERR(newent))
+		goto out_err;
 
 	entry = newent ? newent : entry;
 	if (outarg_valid)
@@ -1277,18 +1280,10 @@ static int fuse_direntplus_link(struct file *file,
 	if (!inode)
 		goto out;
 
-	if (S_ISDIR(inode->i_mode)) {
-		mutex_lock(&fc->inst_mutex);
-		alias = fuse_d_add_directory(dentry, inode);
-		mutex_unlock(&fc->inst_mutex);
-		err = PTR_ERR(alias);
-		if (IS_ERR(alias)) {
-			iput(inode);
-			goto out;
-		}
-	} else {
-		alias = d_splice_alias(inode, dentry);
-	}
+	alias = fuse_materialise_dentry(dentry, inode);
+	err = PTR_ERR(alias);
+	if (IS_ERR(alias))
+		goto out;
 
 	if (alias) {
 		dput(dentry);